I am wondering if that was something lost in translation. Is that "punish" all protestors or "execute" all protesters?
A different source says something different than your emotionally loaded tweet-source, Nutty. May I suggest that you dig a little deeper before you post stuff like that?
227 members of the 290-seat Parliament of Iran have called on the Judiciary to issue death sentences for people arrested during the ongoing anti-government protests.
That's still harsh and nasty, but it's not quite 'execute them all' as presented in your post.
The Judiciary may decline to rule as they have been encouraged to. Or they may take it as a mandate.
We'll see.